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Basis of Preparation and Accounting Policies - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
km
Dec. 31, 2017
USD ($)
km
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Feb. 28, 2018
Dec. 31, 2017
USD ($)
Jan. 01, 2017
CNY (¥)
Jan. 01, 2017
USD ($)
Disclosure of Summary of Significant Accounting Policies [Line items]                
Convenience translation exchange rate per US$1.00         6.3294      
Estimated useful lives of the investment properties 30 years 30 years            
Research and development subsidies ¥ 60,817 $ 9,609 ¥ 26,815          
Percentage of shareholder interest 7.70% 7.70%            
Expected change in trade and other receivables arising from change in measurement attribute, initial application of IFRS 9 ¥ 137,300         $ 21,700    
Expected change in equity arising from change in measurement attribute, initial application of IFRS 9 137,300         21,700    
Selling and distribution expenses 1,815,853 $ 286,892 1,504,360 ¥ 1,497,774        
Revenue 16,222,442 2,563,030 13,664,840 13,733,437        
Cost of sales 12,707,419 2,007,681 10,700,655 10,942,865        
Expected change in retained earnings arising from change in measurement attribute, initial application of IFRS 15             ¥ 83,900 $ 13,300
Other operating income 647,352 102,276 ¥ 117,954 ¥ 106,931        
Warranty obligation [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Expected change in retained earnings arising from change in measurement attribute, initial application of IFRS 15             ¥ (5,300) $ (800)
Performance obligation [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Expected change in retained earnings arising from change in measurement attribute, initial application of IFRS 15 89,200         14,100    
Increase (decrease) due to application of IFRS 15 [member] | Warranty obligation [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Selling and distribution expenses (195,900) (31,000)            
Revenue (21,100) (3,300)            
Cost of sales 176,800 27,900            
Provision for product warranty (19,100)         (3,100)    
Contract liability 21,100         $ 3,300    
Increase (decrease) due to application of IFRS 15 [member] | Performance obligation [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Other operating income (115,200) (18,200)            
Reversal of income tax expense 26,000 4,100            
IAS 18 [member] | Performance obligation [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Gain on sale of intangible asset ¥ 115,200 $ 18,200            
Bottom of range [Member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Lease term 15 years 15 years            
Bottom of range [Member] | On-Road Applications Engines [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Warranty claim period 3 months 3 months            
Warranty mileage 20,000 20,000            
Bottom of range [Member] | Other Applications Engines [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Warranty claim period 12 months 12 months            
Top of range [Member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Lease term 50 years 50 years            
Top of range [Member] | On-Road Applications Engines [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Warranty claim period 36 months 36 months            
Warranty mileage 300,000 300,000            
Top of range [Member] | Other Applications Engines [member]                
Disclosure of Summary of Significant Accounting Policies [Line items]                
Warranty claim period 24 months 24 months